Canon Speedlite 580EX II TTL Flash Logo

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Anonymous Posted on May 20, 2014

The flash ratio between a master unit mounted on my Canon 5D Mark II and slave doesn't work properly. A couple of shots are fine but then all of sudden the slave unit fires ar full power, then a few week shots and then a couple of good shots and then again full power shot. I tested the same setting with other cameras and no problem there. Can be something wrong with my 5D Mark II?

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If you had the ATG Gold MG8k Flash Kim X3, then your 430EX II or 580EX II can transforms into wireless radio ATG ETTL II.

If you are using the outdated wireless IR ETTL with a 580EX II as a Master. Then you have to set the Slave (ATG/580EX II/430EX II) body facing close to the Master.

[email protected]

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5 Related Answers

Anonymous

  • 40 Answers
  • Posted on Apr 29, 2007

SOURCE: Battery dies right away

You might want to try NON rechargeable batteries, particularly "digitally" rated alkalines. If this won't do it, I'd take it to get looked at.

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Anonymous

  • 1 Answer
  • Posted on Jun 02, 2009

SOURCE: Canon Speedlite 580 EX II

is your master flash set on a camera? The EX II has something that makes it have a 1 second delay when using sync mode, unless the master flash is set on the camera.

MIke

  • 685 Answers
  • Posted on Nov 04, 2009

SOURCE: Iam having a problem getting the two flash units

Make sure the slave is far enough in fornt of the master flash to see it. If the two flashes are next to each other then the slave is not seeing the master signals.

Doberman

  • 261 Answers
  • Posted on Jan 18, 2010

SOURCE: reverting to ttl - master flash not firing

Hi Kate,

What camera that you are having problem with those flashes?
Will switching the two have the same problems.
Make sure it is fully pushed forward into hotshoe & locked:-)

Try shooting second current, this will save you the repair costs.

Your exposure compensation was set to zero, but was your flash compensation set at zero?

[email protected]

Anonymous

  • 3006 Answers
  • Posted on May 24, 2010

SOURCE: I mounted the Canon 580EX II to my Canon 5D Mark

Yes. If you were able to set a faster shutter speed, then you would not expose the entire frame and would have the shadow of either the first or second shutter curtain (or both) partially masking the frame.

At higher speeds, the shutter is never fully exposed: before the first shutter curtain has finished travelling across the frame, the second one has stated it's journey. All SLR's have this issue and on some older models you could only use a maximum 1/60th of a second.

In practice though, in dark conditions the "slow" shutter speed does not affect exposure as the true exposure will be determined by how much light the flash puts out, and it puts this light out in as little as 50 microseconds (50 millionths of a second) for a modern electronic flash bulb.

Faster shutter speeds can be used successfully, but only with flashes which operate in high speed mode. What they do is to make the flash burst seem longer by rapidly firing the flash bulb many times. This trick can ensure that there is sufficient light to expose the frame at the highest shutter speeds. Shutters which operate at, say, 1/4000 may seem fast, but compared to the speed at which a single electronic flash burst operates, it's an eternity.

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This video on youtube explains how to setup and use the 600 RT as a master. I do a lot of shooting with master slave, but my equipment is Nikon. Your gear is an excellent choice making it possible to shoot with remote flash. Canon 600ex rt Step by Step Setup Guide
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Canon 580exii speedlight, I want to only use the slaves, but they won't fire when I turn off the master

You didn't say what camera model you are using.
If you have 7D/60D/T4i you can have a total of 3 wireless ir flashes.

580EX II must be set at Master, say Group A & Channel 1
Two 270EX II must be set at Slave, say Group A & Channel 1
or
One 270EX II set at Group A & Channel 1
Second 270EX II set Group A & Channel 2


Then go into camera menu & turn off Master flash & turn settings for those two flashes.



Send me a email, then I can help you much better.

[email protected]
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Iam having a problem getting the two flash units to sink. I have set the parameters by the book for the master and the second the slave. They are both on the same channel. They are both on the ETTL mode....

Make sure the slave is far enough in fornt of the master flash to see it. If the two flashes are next to each other then the slave is not seeing the master signals.
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I have a Canon Speedlite 580EX, the flash will not go off.

Perhaps the unit is set to master/slave mode. Look into that.

hint: Press and hold on the zoom button to get into the master/slave menu
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